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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Supplemental Financial Information [Abstract]    
Deferred tax assets $ 38.8 $ 69.3
Deferred mobilization costs 37.4 35.7
Prepaid taxes on intercompany transfers of property 0.0 33.0
Supplemental executive retirement plan assets 30.9 27.7
Finite-Lived Intangible Assets, Net 15.7 0.3
Other 17.4 9.9
Other assets, net $ 140.2 $ 175.9